I've never been able to find out where this came from. I thought it might be Mdina? maybe an experimental piece or trial...or just oddly finished off on the base, as the pontil mark is ground but not polished and it 'sits' slightly lopsided but firmly on the pontil mark.The yellow is in clear glass and the pale brown swirl goes round and round. Massive bubbles and many smaller bubbles in it. Thick heavy glass.About 5" widex2 3/4" high and weighs 1 1/2lb.Any thoughts much appreciated - thanks m

thanks Sueno, it's not silver chloride, its yellow powders but it's not done in the same way as my yellow and orange verdala bowl interestingly. Not splotches of colour, more swooshes of powder is what it looks like. I was going to put it in the Studio glass section - would it be 80's do you think?m